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Phosphorus Supplying Capacity of Lowland Rice Soils
Author(s) -
DeDatta S. K.,
Moomaw J. C.,
Racho V. V.,
Simsiman G. V.
Publication year - 1966
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1966.03615995003000050023x
Subject(s) - soil water , phosphorus , oryza sativa , agronomy , fertilizer , calcareous , calcareous soils , chemistry , greenhouse , poaceae , environmental science , biology , botany , soil science , biochemistry , organic chemistry , gene
In a greenhouse experiment with rice ( Oryza sativa L.) on four lowland soils, Milfor 6(2), an indica variety from the Philippines, was used to test the relative utilization of soil and fertilizer P (P 32 ‐labelled superphosphate) at various N rates. Added P remaining in solution in six soils was also determined using Ca (H 2 P 32 O 4 ) 2 at various equilibration times. From 8 to 27% of the total P in the plant was derived from applied P, the amount presumably depending on the availability of soil P under continuous submergence. In general the amount derived was not affected by different levels of N fertilization. The results indicate that, by using the ‘A’ value concept, the rice plant itself gives an indication of the P supplying capacity of some flooded rice soils. Results also show that within 4 days of equilibration the added P remaining in solution was lowest in acid latosolic soils containing kaolin type minerals, moderately high in soils containing mainly montmorillonite, and essentially unaltered in calcareous soil.